Isabelle & Isabella: The two girls who charmed the country with their lost rule book full of 157 do's and don'ts score book deal

The two cousins who caused a media sensation when a rule book of theirs was discovered in a Walmart parking lot, are cashing in on their precocious book of do's and don'ts.

In January, 20-year-old Walmart employee Raymond Flores found a notebook full of 157 etiquette tips like 'no saying "ew" when someone farts' and 'do your homework' and wanted to return the book to it's owner.

Isabelle Busath, 10, and her cousin Isabella Thordsen, 8, came forward as the co-authors after the story spread to national news.

Now, the two little girls will be able to share their tips with a larger audience. Simon & Schuster recently signed the girls to a book deal.

'Isabelle and Isabella's Little Book of Rules' will hit shelves this October - now with 200 rules.

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Wunderkind: The authors behind the lost and found book of rules sign their book contract with Simon & Schuster

The girls first gained media attention when their rule book was discovered in the parking lot by a Flores.

Out this October: 'Isabelle and Isabella's Book of Rules' will be published this October. The editors have preserved much of it's original form, including kid handwriting and misspellings

After reading rule number 154 'Protect this rule book' he knew he had to reunite the book with it's rightful owners.

He and a friend contacted some news outlets and the story spread across the country, even getting time on Good Morning America.

'They put a lot of hard work into it,' Flores told Fox40.'These rules mean a lot to them and probably to the parents, as well.'

Flores was right.

Emails
poured into the local Fox affiliate in Sacramento after the station
reported on the book. People across the country said they were touched
by the girls' candid perspectives on good and bad behavior.

The
rules include, 'don't color on people,' 'don't get into other people's
business,' 'don't call each other names, 'don't bite the dentist' and
'no eating other people's food.'

It
was while watching GMA right before an editorial meeting that Simon
& Shuster editor Lisa Rao first heard about the rule book.

She showed the clip on her iPad during an editorial meeting and publisher Valerie Garfield said 'We must find the owner!'

Isabelle's mother saw a Facebook story on the notebook and eventually the girls came forward.

Flores
brought the book to the girls' home and they were ecstatic to have it
back - and shocked at how it became so popular all across the country.

'For just a little book with a bunch of rules in it - Wow,' Isabella told Fox40.

She
said she came up with the idea for the book and decided that 'whoever
breaks [a rule] has to sit at the door for five minutes - and so we came
up with all these good rules.'

Once Simon & Shuster found out, the girls had a contract waiting.

'The
minute I saw the handwriting and heard all the hysterical and the sweet
rules these two had written, I knew I wanted to publish it,' Rao toldPublishers Weekly.
''"Don't bite the dentist?" How could you not want to publish that?'

Rules to live by: Originally the girls wrote 157 rules, but added on more after they were reunited with their notebook. The book in October will include 200 rules

Life lessons: 'No pulling hair' and 'no getting into others faces' are just a few of the words of wisdom Isabelle and Isabella have compiled

According to Rao, the girls started writing the rule book last Christmas as a guidebook for their younger siblings.

'They
had been coloring with crayons and one of the younger kids wrote on
Isabelle, so one of the rules became "Don't color on PEOPLE. They had
the sweetest of intentions.'